Itmatters not __________________, but when you once try to think of a thing,
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you must ______________until you have done it thoroughly and well.
Ifanother man succeeds by one effort, you will ___________________.
If another man succeeds by ten efforts, you______________.
下列生物资产中依据企业所得税法相关规定可以计提折旧的有（ ）。
A. 用材林
B. 防风固沙林
C. 薪炭林
D. 水土保持林
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